Cloudera Docs

Verifying DNS setup

You must verify the DNS setup to ensure that the app domain DNS hostname points to the Load Balancer.

  1. Verify that the app domain DNS hostname has moved from single non-HA ECS Server to the Load Balancer.
    Hostname Expected Roles DNS
    ecs-loadbalancer.example.com Load Balancer Resolves to IP of LB host (or VIP). The example uses 10.10.0.99. Both *.apps.ecs.example.com and apps.ecs.example.com resolve to 10.10.0.99.
  2. Verify the DNS setup with nslookup.
    For example, 
    $ hosts="apps.ecs.example.com foobar.apps.ecs.example.com"
$ for target in $hosts; do nslookup $target; done

Server:	10.10.xx.xx
Address:	10.10.xx.xx#53

apps.ecs.example.com	canonical name = ecs-loadbalancer.example.com.
Name:	ecs-loadbalancer.example.com
Address: 10.10.0.99

Server:	10.10.xx.xx
Address:	10.10.xx.xx#53

Name:	foobar.apps.ecs.​example.com
Address: 10.10.0.99
DNS setup is verified.
You must now install the Load Balancer.